class_docstr: Tests for c4_wsrs dataset.
code: def tearDownClass(cls):
      cls._exit_stack.__exit__(None, None, None)
      super().tearDownClass()
  
file_path: datasets/tensorflow_datasets/text/c4_wsrs/c4_wsrs_test.py
imports: import contextlib
  from unittest import mock
  import tensorflow
  from tensorflow_datasets import testing
  import tensorflow_datasets.public_api
  from tensorflow_datasets.text.c4_wsrs import c4_wsrs
label_desc: Use image node_id 2 for calling the C4WSRSTest obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types